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Cardinality of sets 2001-11-19
From Tania:
  1. Show that the cardinality of P(X) (the power set of X) is equal to the cardinality of the set of all functions from X into {0,1}.

  2. Show that (the cardinality of the natural numbers set) |N| = |NxNxN|.

  3. Show that the cardinality of the set of prime numbers is the same as the cardinality of N+

Answered by Walter Whiteley.
Diagonals in a polygon 1996-06-18
From Steven:
How many diagonals are there in a polygon?
Answered by Denis Hanson.



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